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 ],
 "rules": {
  "caveat": "each monthly sample is made of blocks of consecutive games (the slices of the monthly file), not a random draw: the standard errors are optimistic",
  "compare": "the games of the report month against the games of the month before: two separate monthly samples",
  "min_games": 300,
  "min_relative_share_change": 0.1,
  "min_score_change_points": 0.5,
  "population": "rated Lichess games, both players at most 200 rating points apart, excluded terminations removed, bullet, blitz, rapid and classical together; level = average Lichess rating of both players",
  "score": "the choosing side's wins + half the draws / games that reached the position at the level",
  "se_change": "sqrt(SE_previous^2 + SE_current^2)",
  "se_score": "sqrt((E[x^2] - s^2) / n), x = 1, 1/2 or 0",
  "se_share": "sqrt(p * (1 - p) / N)",
  "share": "games that reached the position at the level / all used games at the level",
  "z_min": 3.0
 },
 "schema": 1,
 "updated": "2026-10-14"
}